Base for trolley-poles



(No Model.)

A. GREEN. BASE FOR TROLLEY POI-ES.

No. 539,681. Patented May 21, 1895.

vi: IA

UNITED STATES vPATE T O FICE.

ALFRED GREEN, OF ROCHESTER, NEW YORK.

BASE FO R TROLLEY-POLES.

SPECIFICATION forming part of Letters Patent No. 539,681, dated May 21, 1895.

Application filed $eptember 5, 1894:. Serial No. 522,157- (No model.)

To aZZ whom it may concern:

Be it known that I, ALFRED GREEN, a citizen of the United States, residing at Rochester, county of Monroe, and State of New York, have invented certain new and useful Improvements in Bases for Trolley-Poles, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

The present invention relates to that class of trolley poles which is pivoted upon aswivcling head, and the improvements consist partly, in the construction for the head and j the stand by which it is supported, and partly, to the arrangement of the springs for sustaining the pole in an elevated position, and the means for attaching and tightening the springs in pairs simultaneously.

The improvements will be understood by reference to the annexed drawings, in which- Figure 1 is a side elevation of the apparatus with the trolley-pole broken for want of space upon the drawings. Fig. 2 is a rear elevation of the same with the step and upper part of the pole omitted. Fig. 3 is aplan of the same with the pole and its fork removed above. the line as 00 in Fig. 1. Fig. iis averiical section of the step with the swiveling head, and Fig. 5 is a plan of the step.

A is the base plate by which the fixture is attached to the roof of the car. B is a socket step formed upon the same and lined with a series of vertical anti-friction rolls 0.

D isthe swiveling head having at the bottom a stud or arbor K fitted movably within the rolls 0, and provided at the top of the stud with a horizontal fl'ange L having at its periphery a depending 'collar M projected downward over the top of the step B so as to wholly exclude dust and water therefrom.

The head D has the spring tension arm E projected from one side near the flange L, and provided at the center of the top with the transverse hole F for the pole hinge F.

G is the pole, with trolley Wheel H, and is forked above the hinge so as to embrace the upper end of the head D. The fork arms I are perforated for the hinge bolt F and extend downward from the same below the level of the tension arm E, and are provided each with a double hook J for the attachment of two springs N. Each double hook is formed of a rod inserted through an eye 0 in the arm I, with its ends bent first forward and .then backwardly. Such construction involves the use of a single piece only for connecting two springs'with the arm, and thus furnishes a very simple, cheap, and compact device to form a double hinge for uniting the springs to the arm; as the rod, by turning in the eye of the arm, forms a horizontal joint as the arm oscillates upon the hinge bolt F; while the hooks J and the eyes upon the springs N permit motion in other'directions.

A'horizontal cross head P is affixed upon the outer end of the tension arm E and is formed with holes P at its opposite ends for tension screws Q, each of which is split at its inner end into two hooks B.

By means of the double hooks J and R, two springs N are attached to each'of the forkarms I, and the tension of each pair of springs may be adjusted simultaneously by the single screw Q. The springs operate in the usual manner to draw the fork-arms I toward the cross head P, and thus press the trolley wheel H elastically upward.

Inmount-ing the apparatus, the rolls 0 are placed within the step B, as shown in Fig. 5, and as the flat ends of the rolls rest upon the flat bottom of the step, they readily remain in their places'ywhile the stud or arbor K upon the swiveling head is inserted in their middle. The head is then sustained niovably by the rolls, so that the trolley pole may be turned to either end of the car at pleasure, and may swing laterally when the wheel H passes around curves.

The construction for the double hooks J and tension screws Q is exceedingly cheap and simple, and furnishes a means of attaching and detaching the springs, and of tightening the same, with the utmost facility. By making the cross head P separate from the tension arm E and affixing it thereon by suitable means, as by the pin P, the cross head may be cast with the holes P therein, and the expense of forging a cross head upon the tension arm, and the drilling of the holes, may be avoided. The whole device thus furnishes a February 7, 1893; No. 457,378, granted August 11, 1891; No. 437,961, granted October 7, 1890, and No. 506,617, granted October 10, 1893. These patents show that anti-friction rolls have been combined with a housing upon the lower end of a trolleypole in connection with a loose sleeve, the base in such case being provided with an upright hub or stud; but the use of the socket step B in my construction serves to retain the rolls in their desired position without anysuch sleeve. These patents also show that tension arms of various constructions have been attached to a swivcling head, and I do not therefore claim such llgead or its tension arms and springs broadly,

Having set forth the nature of my improvements, what I claim as my invention is- 1. The base for trolley pole herein shown and described, comprising the base plate A formed with the socket step B lined with the series of rolls 0, the swiveling head D provided with arbor K fitted within such rolls, the head being provided with spring tension arm E with cross head P having the tension screws Q provided with the double hooks R, the pole G provided with fork arms Ipivoted upon the head D, and the pairs of springs N connecting the tension screws and the fork arms.

2. The base for trolley pole herein shown and described, comprising the base plate A formed with socket step B lined with the series of rolls 0, the swiveling head D prodepending around the top of the step, as and for the purpose set forth, the pole with fork arms I hinged upon the head, the tension arm E with cross head P carrying the double hook screws Q, and the double hooks upon the fork arms, with the pairs of springs connecting such double hooks with the tension screws, substantially as set forth.

3. The base for trolley pole herein shown and described, comprising the base plate A formed with the socket step B lined with the series of rolls O, the swiveling head D provided with arbor K fitted within such rolls, and having the spring tension arm E with the separate cross head P having holes P and the tension ECI'GWS Q with the double hooks R, the pole G provided with fork arms I having the eyes 0 and pivoted upon the center of the head D, the double hooks J formed each of a rod bent first forward and then backward asdescribed, and fitted to the eyes 0, and the pairs of springs N connecting the double hooks J with the double hooks R, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ALFRED GREEN.

Witnesses:

\V. J. MoRAY, J. A. GAVIN. 

